Novel Fabrication of Ca-Doped LaNbO4 Thin-Film Proton-Conducting Fuel Cells by Pulsed Laser Deposition

Thin films of 0.5% Ca‐doped La0.995Ca0.005NbO4−δ (LCNO) proton‐conducting electrolytes of ∼2 μm thickness were obtained by pulsed laser deposition on NiO–LaNbO4 composite substrates. The morphology of the films was granular after annealing at T≤1000°C and evolved to spherical‐like grains at 1100°C a...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2010-07, Vol.93 (7), p.1874-1878
Main Authors: Magrasó, Anna, Xuriguera, Helena, Varela, Manuel, Sunding, Martin F., Strandbakke, Ragnar, Haugsrud, Reidar, Norby, Truls
Format: Article
Language:English
Subjects:
Ceramics
Diffraction
Electrical resistivity
Electrolytes
Pulsed laser deposition
Resistivity
Thin films
X-rays
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Summary:Thin films of 0.5% Ca‐doped La0.995Ca0.005NbO4−δ (LCNO) proton‐conducting electrolytes of ∼2 μm thickness were obtained by pulsed laser deposition on NiO–LaNbO4 composite substrates. The morphology of the films was granular after annealing at T≤1000°C and evolved to spherical‐like grains at 1100°C and above. The structure and composition of the films were characterized by X‐ray diffraction and X‐ray photoelectron spectrocopy. LCNO films showed the monoclinic fergusonite‐type structure at room temperature. The area‐specific resistance for a ∼2‐μm‐thick electrolyte was in the order of 0.4 Ω·cm2 at 600°C based on estimates of the electrode area. Temperature dependency of the electrical conductivity at 600°–700°C was comparable with that of bulk disks of the material.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1551-2916.2010.03650.x